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happened to mine - the bearings were OK, but the surface developed some minute pits which just grew as the resulting powder clumped on the surfaces of the bearing races. Ron expressed surprise, but said that it would not affect performance. eventually most of the hard coating flaked off and I sanded the edges back a bit - still works fine if a bit noisy and crap looking. I suggested they mill some flat tracks for the bearings, but I don't think they ever did. When you think about it, 2 orthogonal cylinders have almost zero contact area, so it's not surprising that the hard coating can give way. Regards Ray
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